Multi-level Approach
Résumé
In the framework of the TILDA project, Dassault Aviation and ONERA have worked on the development of variational multiscale (VMS) approaches to LES in the context of high-order, respectively continuous and discontinuous Galerkin, Finite-Element methods. Dassault Aviation presents the implementation of VMS in its higher-order industrial stabilized continuous finite-element code AeTher, whereas ONERA investigates the performance of the VMS approach based on a high-order DG method. Both authors assess the numerical developments with the Taylor-Green vortex test case at different Reynolds numbers ranging from 1500 to 20,000. VMS results are compared with reference data provided by direct numerical simulation and with simulations obtained using various subgrid scale models and numerical fluxes. LES simulations of the sub-critical flow past a circular cylinder at Reynolds 3900 and 20,000 have also been considered by ONERA.